Update README.md

Author: rouvoy

README.md

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 # PowerAPI
-PowerAPI is a middleware toolkit for buidling software-defined power meters. Software-defined power meters are software librairies that estimates the power consumption of software in real-time. PowerAPI supports the acquisition of raw metrics from a wide diversity of sensors (physical meters, processor interfaces, hardware counters, OS counters) and the delivery of power consumptions via different interfaces (filesystem, network, web, graphical).
+PowerAPI is a middleware toolkit for buidling software-defined power meters. Software-defined power meters are configurable software librairies that can estimate the power consumption of software in real-time. PowerAPI supports the acquisition of raw metrics from a wide diversity of sensors (*eg.*, physical meters, processor interfaces, hardware counters, OS counters) and the delivery of power consumptions via different channels (including filesystem, network, web, graphical). As a middleware toolkit, PowerAPI offers the capability of assemblying power meters *«à la carte»* to accomodate user requirements.
 
 # About
 PowerAPI is an open-source project developed by the [Spirals research group](https://team.inria.fr/spirals) (University of Lille 1 and Inria).
 
+# Mailing list
+You can follow the latest news and asks questions by subscribing to our [mailing list](https://sympa.inria.fr/sympa/info/powerapi).
+
+# Contributing
+If you would like to contribute code you can do so through GitHub by forking the repository and sending a pull request.
+
+When submitting code, please make every effort to follow existing conventions and style in order to keep the code as readable as possible.
+
 # Acknowledgments
-We all stand on the shoulders of giants and get by with a little help from our friends. PowerAPI is written in [Scala](http://www.scala-lang.org) and built on top of:
-* [Akka](http://akka.io), for async processing
+We all stand on the shoulders of giants and get by with a little help from our friends. PowerAPI is written in [Scala](http://www.scala-lang.org) (version 2.11.4 under [3-clause BSD license](http://www.scala-lang.org/license.html)) and built on top of:
+* [Akka](http://akka.io) (version 2.2.4 under [Apache 2 license](http://www.apache.org/licenses/LICENSE-2.0)), for asynchronous processing
 
 # Licence
-This software is licensed under the GNU Affero General Public License, quoted below.
+This software is licensed under the *GNU Affero General Public License*, quoted below.
 
-Copyright (C) 2011-2014 Inria, University Lille 1.
+Copyright (C) 2011-2014 Inria, University of Lille 1.
 
 PowerAPI is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.